WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: ABS Schematics (Power, Ground, and Serial Data)
Courtesy of GENERAL MOTORS CORP.
Fig 2: ABS Schematics (Indicators)
Courtesy of GENERAL MOTORS CORP.
Fig 3: ABS Schematics (Stop Lamp and Torque Signals)